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Explain How Cells Use Active Transport

Worksheet Overview

Active transport is the movement of substances from an area of low concentration to a higher concentration, either into or out of cells.


Image of carrier proteins and active transport



During active transport, carriers in the cell membrane ‘pick up’ particles and move them against the concentration gradient.

As the name suggests, active transport requires energy from the cell, which is made available by respiration.


Image showing active transport


In the picture above, there are three particles outside the cell and five particles inside the cell. The three particles will be carried through to the inside of the cell by the carrier protein, using energy to do so.



Uses of Active Transport


 Image of villi in intestine



During digestion, the villi in the small intestine absorb the nutrients from our digested food. Over time, the concentration of nutrients in the villi becomes equal to the concentration in the gut. The cells need these nutrients, so active transport is used to continue the transporting of the small amounts of remaining nutrients. 

Image of root hair cell



Plants need to absorb minerals such as nitrogen, phosphorus and potassium from the soil for healthy growth. When the concentration of minerals in the soil is lower than inside the plant, active transport is used to absorb the minerals against the concentration gradient. If plants used diffusion instead of active transport, the plants would be drained of all their minerals because they would travel down the concentration gradient - the plant would lose all its nutrients to the soil.


In the following activity, you will explain how cells use the process of active transport. 

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